JP3674682B2 - On-off valve device for turbocharger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust turbine-driven turbocharger used in an internal combustion engine, and more particularly to open and close an on-off valve provided in an exhaust flow path in order to increase an exhaust flow velocity when the exhaust flow rate is small in a low rotation range. The present invention relates to an on-off valve device for a turbocharger to be controlled.
[0002]
[Prior art]
This type of turbocharger drives a turbine with the exhaust energy of an internal combustion engine, rotates a coaxial blower with its rotational force, compresses intake air, and supplies it to the engine cylinders. In the rotation range, the turbine cannot be rotated at high speed because the displacement is small. For this reason, a turbocharger is conventionally known in which an open / close valve (variable nozzle) is provided in the exhaust flow path, and an open / close valve control mechanism for opening / closing the open / close valve in accordance with the exhaust flow rate is provided.
[0003]
As such an on-off valve device, conventionally, an annular support board attached to the main body supports a plurality of valve shafts coupled to each on-off valve, and three support rollers can be rotated at intervals of about 120 °. A sliding ring is arranged on the outside of these three support rollers so as to be slidable in the circumferential direction, and a plurality of pins project from the sliding ring, and an arm is attached to each pin. Japanese Patent Application Laid-Open No. 11-336553 discloses a structure in which the base portions of these arms are engaged with the valve shaft of the support plate.
[0004]
[Problems to be solved by the invention]
This turbocharger on-off valve device is supported via an arm by linking a single pin fixed on the sliding ring to the actuator and moving the sliding ring in the circumferential direction by the actuator. The valve shaft on the panel is rotated to change the angle of the on-off valve to control the opening degree of the exhaust passage.
[0005]
With this structure, the on-off valve device can open and close the on-off valve by sliding the sliding ring in accordance with the displacement, regardless of the thermal expansion of each part of the turbocharger. The three support rollers that slidably support the sliding ring are formed by combining a specially shaped inner roller with a shaft and an outer roller, so the assembly work of the supporting roller and the sliding ring is very complicated There was a problem.
[0006]
In addition, this on-off valve device has a structure in which an annular sliding ring is supported by the inner roller and the outer roller flanges of three support rollers arranged at intervals of about 120 °. There was a problem that large friction occurred between the inside of the flange portion of the roller and the inside of the sliding ring, and that portion was easily worn.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide an on-off valve device for a turbocharger that can be easily assembled and can reduce wear of a sliding ring.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an on-off valve device according to the present invention includes a disc-shaped support plate, a plurality of on-off valves that are supported by one surface of the support plate so as to be openable and closable, and a support plate. A sliding ring that is slidable in the circumferential direction along the surface, a plurality of support rollers that slidably support the sliding ring on its inner side, and a shaft that is attached to the end of the valve shaft and slides A turbocharger comprising a plurality of link arms each having a tip engaged with the ring, and sliding the sliding ring in the circumferential direction to open and close the on-off valve via the link arm and the valve shaft In this on-off valve device, the support roller is composed of a plurality of first support rollers provided with flange portions on the side opposite to the support plate and a plurality of second support rollers provided with flange portions on the support plate side. And the second support roller between a predetermined angle in the circumferential direction At a are alternately arranged, the second support roller, characterized in that it is supported by the support pins headless.
[0009]
Here, it is effective to form the outer diameter of the flange portion of the second support roller larger than the outer diameter of the flange portion of the first support roller. The three first support rollers are pivotally supported on the support plate at intervals of about 120 °, and the three second support rollers are placed on the support plate at intervals of about 120 ° at an intermediate position of the first support roller. The first support roller and the second support roller may be alternately arranged in the circumferential direction by supporting the shaft.
[0010]
[Action]
In the on / off valve device for a turbocharger having such a configuration, when assembling the sliding ring, first, a plurality of second support rollers are axially supported along the circumferential direction on the support plate, and the second support thereof. Fit the sliding ring to the supporting roller so that it is supported by the roller, and then attach a plurality of first supporting rollers with flanges on the front side to support the inside of the sliding ring Therefore, the sliding ring can be easily assembled as compared with the conventional case.
[0011]
The mounted sliding ring has a first support roller whose inner side is separately supported and has a flange portion on the front side (anti-support plate side), and a second support roller that has a flange portion on the support plate side. And is supported so as to be slidable in the circumferential direction. Therefore, compared with the conventional case where the support roller having both flange portions of the inner roller and the outer roller is supported so as to sandwich the slide ring, the friction with the roller contact portion of the slide ring is less, and the slide Ring wear can be reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a partial cross-sectional perspective view of a turbocharger, and FIG. 2 shows a front view of the on-off valve device 10 viewed from the side opposite to the turbine wheel. In FIG. 1, 1 is a turbine housing, 2 is a compressor housing, and both the housings 1 and 2 accommodate a turbine wheel 4 and a blower wheel coaxially therein and are assembled together.
[0013]
The turbine housing 1 has a spiral exhaust supply path 1a, an exhaust inlet 1b, and an exhaust outlet 1c, and a turbine wheel 4 is rotatably disposed therein. The compressor housing 2 has an intake air supply path and an intake inlet (not shown) and an intake outlet 2b, and a blower wheel (not shown) is rotatably disposed therein. The turbine wheel 4 and the blower wheel are coupled by a coupling shaft that is rotatably supported by a ball bearing.
[0014]
An on-off valve device 10 provided with an on-off valve 5 (variable nozzle) that can be opened and closed (the angle can be changed) is disposed at a rear position of the turbine wheel 4 in the turbine housing 1. As shown in FIGS. 2 to 5, the on-off valve device 10 has a plurality of on-off valves (movable vanes) 5 arranged at predetermined intervals on the turbine wheel 4 side on a disc-like support plate 11 with a central portion removed. Then, the valve shaft 6 is pivotally supported so that it can be opened and closed. 16, the link arm 17 etc. are attached and comprised.
[0015]
The on-off valve 5 of the on-off valve device 10 is formed in a movable vane shape and is disposed at the outer peripheral position of the turbine wheel 4 as shown in FIG. Each on-off valve 5 is fixed to the tip of a valve shaft 6 that is rotatably inserted through the support plate 11, and its angle (opening) is changed by the rotation of the valve shaft 6, so that the exhaust passage Control the degree of opening.
[0016]
As shown in FIG. 3, the end of each valve shaft 6 protrudes to the side opposite to the turbine wheel of the support plate 11, and a link arm 17 is pivotally attached thereto. As shown in FIG. 2, twelve on-off valves 5 (valve shafts 6) are arranged on the support plate 11 on the circumference at intervals of 30 °, for example, and link arms 17 are arranged at the ends of the respective valve shafts 6. Is attached toward the outer periphery.
[0017]
Each on-off valve 5 has a structure that opens and closes via a link arm 17. In order to rotate the link arm 17, an annular sliding ring 12 is provided along the surface of the support plate 11 in the circumferential direction. It is arranged to be movable. That is, the sliding ring 12 has a structure in which, for example, 12 engagement pins 19 are projected on the circumference at intervals of 30 °, and one drive connecting pin 18 is projected on the surface of the annular body. Then, it is supported by a first support roller 13 and a second support roller 14 described later so as to be movable in the circumferential direction. Further, the sliding ring 12 is formed so that the width of the portion to which the engaging pin 19 and the drive connecting pin 18 are attached is wider than the other portions.
[0018]
The first support roller 13 and the second support roller 14 that support the sliding ring 12 so as to be movable in the circumferential direction are alternately arranged on the surface of the support plate 11 at intervals of 60 °, for example. In other words, the three first support rollers 13 are arranged along the inside of the sliding ring 12 at an interval of about 120 °, and the three second support rollers 14 are slid to the intermediate position of the first support roller 14. Along the inside of the moving ring 12 are arranged at intervals of about 120 °. As a result, the three first support rollers 13 and the three second support rollers 14 are alternately arranged at intervals of about 60 ° in the circumferential direction, as shown in FIG.
[0019]
The first support roller 13 is rotatably supported by a first support pin 15, and the second support roller 14 is rotatably supported by a second support pin 16. As shown in FIGS. 6A and 6B, the first support pin 15 is formed with a large-diameter head 15a, and the second support pin 16 is formed in a straight bar shape without a head. As shown in FIG. 5, both the first support pin 15 and the second support pin 16 are fixed by fitting their tips into holes formed at predetermined positions of the support plate 11.
[0020]
As shown in FIG. 6C, the first support roller 13 inserted and supported by the first support pin 15 is formed by providing a shaft hole 13b drilled at the center axis position and a flange portion 13a. Further, as shown in FIG. 6D, the second support roller 14 fitted and supported by the second support pin 16 is formed by providing a shaft hole 14b drilled at the center axis position and a flange portion 14a. The
[0021]
Here, the outer diameter D2 of the flange portion 14a of the second support roller 14 is formed larger than the outer diameter D1 of the flange portion 13a of the first support roller 13. In this way, by making the outer diameter D2 of the flange portion 14a larger than the outer diameter D1 of the flange portion 13a, the flange portion 14a on the support plate 11 side for the sliding ring 12 that easily receives a force toward the support plate 11 side. The contact area of the flange portion 14a receiving the force increases, the surface pressure per unit area applied thereto is reduced, the friction with the sliding ring 12 is reduced, and the amount of wear can be minimized. .
[0022]
The first support roller 13 is inserted into the first support pin 15 through the shaft hole 13b and is rotatably fitted and supported there. The second support roller 14 is inserted through the second support pin 16 through the shaft hole 14b. It is externally fitted and supported by the lever.
[0023]
Twelve engagement pins 19 project from the surface of the sliding ring 12 with an interval of about 30 °, and an engagement recess 17a at the tip of the link arm 17 is engaged with each engagement pin 19. A fixed hole is formed in the base portion of the link arm 17, and this link hole is fitted to the tip of the valve shaft 6 of the on-off valve 5, and each link arm 17 is attached to the valve shaft 6.
[0024]
When assembling the on-off valve device, first, the twelve on-off valves 5 are attached to the support plate 11 by inserting the valve shafts 6 through the through holes, and the three second support pins 16 are arranged at predetermined positions on the support plate 11. It is fitted and fixed in holes provided at intervals of 120 °, the second support roller 14 is placed on each second support pin 16, and the flange portion 14a is positioned on the support plate 11 side as shown in FIG. The central shaft hole is inserted and rotatably inserted.
[0025]
Next, the sliding ring 12 is fitted so that the inner side of the annular sliding ring 12 is guided and supported by the outer peripheral portions of the three second support rollers 14. At this time, the three second support rollers 14 arranged at intervals of 120 ° have their flange portions 14a positioned on the support plate 11 side, and are externally fitted and supported on a rod-like second support pin 16 without a head. Therefore, the sliding ring 12 can be easily fitted while being guided outside the three second support rollers 14.
[0026]
In this state, the three second support pins 15 through which the first support rollers 13 are inserted are inserted into the holes at intervals of 120 ° arranged at intermediate positions of the three second support pins 16, and the tip portions thereof are placed. At this time, the outer peripheral portion of the three first support rollers 13 and the flange portion 13a are in contact with the inner side of the sliding ring 12 to be supported. In this state, the sliding ring 12 is supported so as to be slidable in the circumferential direction by three first support rollers 13 and three second support rollers 14 arranged alternately at intervals of 60 °. . Then, the twelve link arms 17 are fitted to the ends of the twelve valve shafts 6 whose original holes protrude from the surface of the support plate 11, and the engagement recesses 17 a at the tips of the twelve link arms 17 are fitted to the sliding ring 12. Each link arm 17 is attached so as to engage with an engagement pin 19 projecting at an interval of 30 ° on the surface of the link.
[0027]
As shown in FIG. 1, the on-off valve device 10 assembled in this way is attached to the opening on the back side of the turbine housing 1 with the on-off valve 5 side facing the exhaust supply path 1 a of the turbine housing 1. Further, a lid is fixed to the rear side so as to close the inside of the housing. At this time, the operating shaft 3a of the actuator 3 is connected to the driving connecting pin 18 protruding outward through the hole of the lid.
[0028]
The turbocharger provided with the opening / closing valve device 10 having the above-described configuration introduces exhaust gas discharged from the internal combustion engine into the exhaust gas supply passage 1a during operation, and rotationally drives the turbine wheel 4, whereby a coaxial blower wheel is driven. Is rotated to compress the intake air and supply compressed air to the cylinders of the engine. The actuator 3 operates in accordance with the rotational speed range of the engine, and the sliding ring 12 linked by the drive connecting pin 18 moves in the circumferential direction via the operating shaft 3a. At this time, the sliding ring 12 As a result of the movement, the twelve link arms 17 rotate around the valve shaft 6. As a result, the on-off valve 5 operates so as to change the opening of the flow path by changing the direction of the tip of the vane, thereby changing the flow velocity of the exhaust gas flowing through the turbine wheel 4 and rotating the turbine at a high speed even in a region where the exhaust amount is small. Control is performed so that
[0029]
The graph of FIG. 7 shows a change in the amount of wear of the sliding ring 12 with respect to the area ratio of the contact portion of the support roller (second support roller 14) when a prototype experiment of the on-off valve device is performed. In this experiment, the size of the flange portion 14a of the second support roller 14 with respect to the flange portion 13a of the first support roller 13 is changed, and the wear of the contact portion (contact portion with the flange portion 14a) of the sliding ring 12 at that time is changed. The amount was measured. The support roller contact area ratio S is
S = (Area of a portion where the flange portion 14a and the sliding ring 12 are in contact) / (Area of a portion where the flange portion 13a and the sliding ring 12 are in contact)
This is the value obtained from the equation.
[0030]
From this experimental result, as shown in the graph of FIG. 7, as the support roller contact portion area ratio S is higher, that is, as the flange portion 14 a of the second support roller 14 is larger than the flange portion 13 a of the first support roller 13, It can be seen that the amount of wear of the sliding ring 12 is reduced. When the sliding ring 12 of the on-off valve device 10 is in a steady state, a force acts on the support plate 11 side via the drive connecting pin 18, and this force is received by the flange portion 14 a of the second support roller 14. By increasing the size of the portion, that is, the contact area, the surface pressure per unit area on the surface can be reduced, and the amount of wear of the sliding ring 12 can be reduced.
[0031]
【The invention's effect】
As described above, according to the on / off valve device for a turbocharger of the present invention, when the sliding ring is assembled, a plurality of second support rollers having flange portions on the support plate side are attached to the support plate. The sliding ring is inserted so that the second supporting rollers are guided and supported, and then the first supporting roller having a flange portion on the side opposite to the support plate, that is, the front side, is supported on the inside of the sliding ring. Since it only needs to be attached to the support plate, the sliding ring can be easily assembled as compared with the conventional case. Furthermore, the inner side of the mounted sliding ring is circumferentially separated by a first support roller having a flange portion on the front side and a second support roller having a flange portion on the front side and a second support roller having a flange portion on the front side. Compared to the case where the support roller having both flange portions of the inner roller and the outer roller is supported so as to sandwich the slide ring, the roller contact portion of the slide ring is conventionally supported. And the wear of the sliding ring can be reduced.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional perspective view of a turbocharger showing an embodiment of the present invention.
2 is a front view of the on-off valve device 10. FIG.
3 is a cross-sectional view taken along the line III-III in FIG.
4 is a partially enlarged sectional view in the sectional view of FIG. 3;
FIG. 5 is an enlarged cross-sectional view of VV in FIG. 2;
6A is a perspective view of the first support pin 15, FIG. 6B is a perspective view of the second support pin 16, FIG. 6C is a perspective view of the first support roller 13, and FIG. 6D is a second support roller. 14 is a perspective view of FIG.
FIG. 7 is a graph showing the amount of wear of the sliding ring with respect to the area ratio of the contact portion of the support roller.
[Explanation of symbols]
5-Opening and closing valve 6-Valve shaft 10-Opening and closing valve device 11-Support plate 12-Slide ring 13-First support roller 14-Second support roller 15-First support pin 16-Second support pin 17-Link arm

Claims (3)

A disc-shaped support plate, a plurality of on-off valves supported on one surface of the support plate so as to be openable and closable through the valve shaft, and arranged to be movable in the circumferential direction along the other surface of the support plate A sliding ring, a plurality of support rollers that slidably support the sliding ring inside, and a plurality of shafts that are pivotally attached to the end of the valve shaft and have their tips engaged with the sliding ring. A link arm,
In an on-off valve device for a turbocharger that slides the slide ring in the circumferential direction to open and close the on-off valve via the link arm and the valve shaft,
The support roller includes a plurality of first support rollers provided with a flange portion on the side opposite to the support plate and a plurality of second support rollers provided with a flange portion on the support plate side, and the first support roller and the second support roller An on-off valve device for a turbocharger, wherein support rollers are alternately arranged at predetermined angular intervals in the circumferential direction, and the second support rollers are supported by support pins without a head. The on-off valve device for a turbocharger according to claim 1, wherein an outer diameter of the flange portion of the second support roller is formed larger than an outer diameter of the flange portion of the first support roller. Three of the first support rollers are pivotally supported on the support plate at an interval of about 120 °, and three of the second support rollers are at an intermediate position of the first support roller at an interval of about 120 °. 2. The on-off valve device for a turbocharger according to claim 1, wherein the first support roller and the second support roller are alternately arranged in the circumferential direction by being pivotally supported upward. 3.

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